Tacho Generator Sensor

Sensors are often used for angular velocity sensors are tacho generator. The tacho generator is a small generator that generates a DC voltage or AC voltage. In terms of tacho generator excitation can be generated by the excitation of the outside or electromagnetic impact of the permanent magnet. DC tacho generator can generate a DC voltage that can directly produce information about the speed, sensitivity DC tacho generator is quite good especially at high speed areas.

Tacho high-grade DC generators having magnetic poles that much so as to generate a DC voltage with high frequency ripple so easily leveled. The main advantage of the tacho generator is obtaining information from the direction of rotation. While the weaknesses are:
1. Brush commutator easily exhausted
2. If it is used in high-temperature areas, the permanent magnet will experience fatigue, for this case, tacho generators are often calibrated.
3. Be sensitive to dust and corrosion

Tacho synchronous AC generator such as a generator, a permanent magnet is placed in the middle that serves as a rotor. While the coil-shaped stator soft iron. When the rotor spins induced voltage generated in the stator section. Another type of tacho generator AC is the type of induction, the rotor is made of jagged, such stator coils of wire around an iron core. Permanent magnetic field in the stator are installed together. When the rotor spins, changes the magnetic field in the teeth which then spill over into the stator windings.

The main advantages of the tacho generator AC is relatively resistant to corrosion and dust, while weakness is not providing information the direction of motion.

Figure 3:45 Construction Tacho Generator DC

3:46 image Tacho Generator AC Construction

Figure 3:47 Construction Tacho Generator rotor AC with a serrated